Question 1

What is the difference between SWL and WLL?

Accepted Answer

SWL (Safe Working Load) is an older term that refers to the maximum load a piece of equipment can safely handle. WLL (Working Load Limit) is the modern equivalent, used in current regulations like LOLER. Both indicate the maximum force that can be applied, but WLL is now the standard term in the industry. Always check the equipment's marking for the correct value.

Question 2

How do I calculate the load on a sling when lifting at an angle?

Accepted Answer

When lifting at an angle, the tension in each sling leg increases. Use the formula: Tension = (Load / Number of legs) × (1 / sin(angle)). For example, if lifting a 1000 kg load with two legs at 60°, tension = (1000/2) × (1/sin60°) = 500 × 1.155 = 577.5 kg per leg. Always ensure the tension does not exceed the sling's WLL.

Question 3

What hand signals should I know for crane operations?

Accepted Answer

Key hand signals include: 'Stop' (arm extended, palm down, moving side to side), 'Hoist' (arm up, index finger pointing up, moving in small circles), 'Lower' (arm down, index finger pointing down, moving in small circles), and 'Slew' (arm out, pointing in direction of travel). You must be able to give and interpret these signals clearly.

Question 4

What is LOLER and how does it affect my work?

Accepted Answer

LOLER (Lifting Operations and Lifting Equipment Regulations 1998) requires that all lifting equipment is fit for purpose, inspected regularly, and used safely. As a rigger, you must ensure equipment has valid inspection records, report any defects, and follow the planned lifting procedures. Non-compliance can lead to accidents and legal penalties.

Question 5

How often should lifting accessories be inspected?

Accepted Answer

Lifting accessories like slings and shackles must be thoroughly examined at least every 6 months, or more frequently if used in harsh conditions. Additionally, a pre-use check should be done daily by the user. Records of inspections must be kept and available for review.

Question 6

Can I use a damaged sling if the damage is minor?

Accepted Answer

No. Any damage, such as cuts, fraying, or deformation, can reduce the sling's strength and lead to failure. Even minor damage should be reported, and the sling taken out of service until inspected by a competent person. Safety is paramount; never compromise on equipment condition.